arch/mn10300/include/asm/tlbflush.h

   1 /* MN10300 TLB flushing functions
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #ifndef _ASM_TLBFLUSH_H
  12 #define _ASM_TLBFLUSH_H
  13
  14 #include <linux/mm.h>
  15 #include <asm/processor.h>
  16
  17 struct tlb_state {
  18         struct mm_struct        *active_mm;
  19         int                     state;
  20 };
  21 DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
  22
  23 /**
  24  * local_flush_tlb - Flush the current MM's entries from the local CPU's TLBs
  25  */
  26 static inline void local_flush_tlb(void)
  27 {
  28         int w;
  29         asm volatile(
  30                 "       mov     %1,%0           \n"
  31                 "       or      %2,%0           \n"
  32                 "       mov     %0,%1           \n"
  33                 : "=d"(w)
  34                 : "m"(MMUCTR), "i"(MMUCTR_IIV|MMUCTR_DIV)
  35                 : "cc", "memory");
  36 }
  37
  38 /**
  39  * local_flush_tlb_all - Flush all entries from the local CPU's TLBs
  40  */
  41 static inline void local_flush_tlb_all(void)
  42 {
  43         local_flush_tlb();
  44 }
  45
  46 /**
  47  * local_flush_tlb_one - Flush one entry from the local CPU's TLBs
  48  */
  49 static inline void local_flush_tlb_one(unsigned long addr)
  50 {
  51         local_flush_tlb();
  52 }
  53
  54 /**
  55  * local_flush_tlb_page - Flush a page's entry from the local CPU's TLBs
  56  * @mm: The MM to flush for
  57  * @addr: The address of the target page in RAM (not its page struct)
  58  */
  59 static inline
  60 void local_flush_tlb_page(struct mm_struct *mm, unsigned long addr)
  61 {
  62         unsigned long pteu, flags, cnx;
  63
  64         addr &= PAGE_MASK;
  65
  66         local_irq_save(flags);
  67
  68         cnx = 1;
  69 #ifdef CONFIG_MN10300_TLB_USE_PIDR
  70         cnx = mm->context.tlbpid[smp_processor_id()];
  71 #endif
  72         if (cnx) {
  73                 pteu = addr;
  74 #ifdef CONFIG_MN10300_TLB_USE_PIDR
  75                 pteu |= cnx & xPTEU_PID;
  76 #endif
  77                 IPTEU = pteu;
  78                 DPTEU = pteu;
  79                 if (IPTEL & xPTEL_V)
  80                         IPTEL = 0;
  81                 if (DPTEL & xPTEL_V)
  82                         DPTEL = 0;
  83         }
  84         local_irq_restore(flags);
  85 }
  86
  87 /*
  88  * TLB flushing:
  89  *
  90  *  - flush_tlb() flushes the current mm struct TLBs
  91  *  - flush_tlb_all() flushes all processes TLBs
  92  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  93  *  - flush_tlb_page(vma, vmaddr) flushes one page
  94  *  - flush_tlb_range(mm, start, end) flushes a range of pages
  95  *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
  96  */
  97 #ifdef CONFIG_SMP
  98
  99 #include <asm/smp.h>
 100
 101 extern void flush_tlb_all(void);
 102 extern void flush_tlb_current_task(void);
 103 extern void flush_tlb_mm(struct mm_struct *);
 104 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 105
 106 #define flush_tlb()             flush_tlb_current_task()
 107
 108 static inline void flush_tlb_range(struct vm_area_struct *vma,
 109                                    unsigned long start, unsigned long end)
 110 {
 111         flush_tlb_mm(vma->vm_mm);
 112 }
 113
 114 #else   /* CONFIG_SMP */
 115
 116 static inline void flush_tlb_all(void)
 117 {
 118         preempt_disable();
 119         local_flush_tlb_all();
 120         preempt_enable();
 121 }
 122
 123 static inline void flush_tlb_mm(struct mm_struct *mm)
 124 {
 125         preempt_disable();
 126         local_flush_tlb_all();
 127         preempt_enable();
 128 }
 129
 130 static inline void flush_tlb_range(struct vm_area_struct *vma,
 131                                    unsigned long start, unsigned long end)
 132 {
 133         preempt_disable();
 134         local_flush_tlb_all();
 135         preempt_enable();
 136 }
 137
 138 #define flush_tlb_page(vma, addr)       local_flush_tlb_page((vma)->vm_mm, addr)
 139 #define flush_tlb()                     flush_tlb_all()
 140
 141 #endif /* CONFIG_SMP */
 142
 143 static inline void flush_tlb_kernel_range(unsigned long start,
 144                                           unsigned long end)
 145 {
 146         flush_tlb_all();
 147 }
 148
 149 static inline void flush_tlb_pgtables(struct mm_struct *mm,
 150                                       unsigned long start, unsigned long end)
 151 {
 152 }
 153
 154 #endif /* _ASM_TLBFLUSH_H */